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Python – Check for Key in Dictionary Value list
  • Last Updated : 01 Mar, 2020

Sometimes, while working with data, we might have a problem we receive a dictionary whole key has list of dictionaries as value. In this scenario, we might need to find if a particular key exists in that. Let’s discuss certain ways in which this task can be performed.

Method #1 : Using any()
This is simple and most recommended way in which this task can be performed. In this, we just check for the key inside the values by iteration.




# Python3 code to demonstrate working of 
# Check for Key in Dictionary Value list
# Using any()
    
# initializing dictionary 
test_dict = {'Gfg' : [{'CS' : 5}, {'GATE' : 6}], 'for' : 2, 'CS' : 3
    
# printing original dictionary 
print("The original dictionary is : " + str(test_dict)) 
    
# initializing key
key = "GATE"
    
# Check for Key in Dictionary Value list
# Using any()
res = any(key in ele for ele in test_dict['Gfg'])
    
# printing result  
print("Is key present in nested dictionary list ?  : " + str(res)) 


Output :

The original dictionary is : {'Gfg': [{'CS': 5}, {'GATE': 6}], 'for': 2, 'CS': 3}
Is key present in nested dictionary list ?  : True

 

Method #2 : Using list comprehension + in operator
The combination of above functionalities can be used to perform this task. In this, we iterate through the list using comprehension and perform key flattening and store keys. Then we check for desired key using in operator.






# Python3 code to demonstrate working of 
# Check for Key in Dictionary Value list
# Using list comprehension + in operator
    
# initializing dictionary 
test_dict = {'Gfg' : [{'CS' : 5}, {'GATE' : 6}], 'for' : 2, 'CS' : 3
    
# printing original dictionary 
print("The original dictionary is : " + str(test_dict)) 
    
# initializing key
key = "GATE"
    
# Check for Key in Dictionary Value list
# Using list comprehension + in operator
res = key in [sub for ele in test_dict['Gfg'] for sub in ele.keys()]
    
# printing result  
print("Is key present in nested dictionary list ?  : " + str(res)) 


Output :

The original dictionary is : {'Gfg': [{'CS': 5}, {'GATE': 6}], 'for': 2, 'CS': 3}
Is key present in nested dictionary list ?  : True

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